St. Louis County Courts Division 66


Courtroom: 502
Floor: 5 North
Court Reporter:

Phone: 314-615-7565
Fax: 314-615-8293

William J. Gust


William J. Gust was appointed in 2019 to a four-year term as Probate Commissioner for the 21st Judicial Circuit. Prior to his appointment, Gust was a shareholder at Polsinelli PC. He has more than a decade of experience in trust and estate litigation and complex civil litigation, and has authored articles relating to trust and estate litigation.

Commissioner Gust is a member of the Probate Section of the Missouri Bar and is Vice Chairman of the Fiduciary Litigation Committee of the Missouri Bar. Gust was named a Rising Star by "Super Lawyers" from 2015-2018. He is a graduate of the University of Missouri-Columbia School of Law.

He is a current board member of the Young Friends of Legal Services of Eastern Missouri and previously served on the Young Friends Leadership Council of St. Louis Public Radio.